12 Sep

Vim game

To learn Vim with fun I started to search for some interactive guide with some practical step-by-step tasks.

I found a game that helps to remember the main Vim shortcuts:

git clone git://github.com/kikuchiyo/vim_game.git

Although I needed to spend some time to find out how to compile Ruby app with all dependencies.
Here is the recipe that worked for me:

First of all you need have installed MySQL server and Ruby itself:

sudo apt-get install mysql-server
sudo apt-get install ruby

Then install bundler (dependency tool for Ruby):

sudo apt-get install ruby-bundler

You’ll also need Qt 4 (couldn’t completely compile app with Qt 5 but I guess it should be installed as well):

sudo apt-get install qt4-default

Install dependencies:

sudo apt-get install libqt5webkit5-dev
sudo apt-get install qtquick1-5-dev qtlocation5-dev qtsensors5-dev qtdeclarative5-dev
sudo apt-get install libsqlite3-dev libmysql-ruby libmysqlclient-dev

Then try to set up the application itself:

bundle install
bundle exec rake db:drop db:create db:schema:load db:migrate
bundle exec rails s

Enjoy!

29 May

Xubuntu-desktop (XFCE) recipes

How to move from Ubuntu 13.04 to Xubuntu (Xfce)?

Good steb-by-step manual: https://sites.google.com/site/easylinuxtipsproject/alternative

How to create keyboard layout shortcut?

setxkbmap  -option grp:caps_toggle,grp_led:scroll "us,ru"

How to make desktop icons text transparent (icons shadow analog on Windows)?

Run vi ~/.gtkrc-2.0 and add the following config there:

style "xfdesktop-icon-view" {
  ## opacity of text background (0 - 255, 0 = transparent)
  XfdesktopIconView::label-alpha = 0
  XfdesktopIconView::selected-label-alpha = 100

  ## text background colors
  base[NORMAL]    = "#EDECEB"
  base[ACTIVE]    = shade (0.8, "#86ABD9")
  base[SELECTED]  = "#86ABD9"

  ## text foreground colors
  fg[NORMAL]      = shade (0.9, "#FFFFFF")
  fg[ACTIVE]      = shade (0.8, "#FFFFFF")
  fg[SELECTED]    = "#FFFFFF"

  ## whether or not unselected icon text gets truncated (...)
  # XfdesktopIconVIew::ellipsize-icon-labels = 1

  ## text shadow to be painted with the icon labels
  # XfdesktopIconView::shadow-x-offset = 0
  # XfdesktopIconView::shadow-y-offset = 0
  # XfdesktopIconView::shadow-color = "#000000"
  # XfdesktopIconView::selected-shadow-x-offset = 0
  # XfdesktopIconView::selected-shadow-y-offset = 0
  # XfdesktopIconView::selected-shadow-color = "#ffffff"

  ## spacing and sizing of icons on the grid
  # XfdesktopIconVIew::cell-spacing = 6
  # XfdesktopIconView::cell-padding = 6
  # XfdesktopIconView::cell-text-width-proportion = 2.5
}
widget_class "*XfdesktopIconView*" style "xfdesktop-icon-view" 
19 Nov

GWT Designer for Eclipse Juno on Ubuntu 12.X

Today I’ve tried to install Google Eclipse Plugin to draw some forms for my GWT-based app and caught the exception:

GWT http-server started at 127.0.0.1:45658
#
# A fatal error has been detected by the Java Runtime Environment:
#
#  SIGSEGV (0xb) at pc=0x00007fb2229d45a0, pid=8150, tid=140404439688960
#
# JRE version: 6.0_37-b06
# Java VM: Java HotSpot(TM) 64-Bit Server VM (20.12-b01 mixed mode linux-amd64 compressed oops)
# Problematic frame:
# C  [libwebkitgtk-1.0.so.0+0x14245a0]  void WTF::freeOwnedGPtr<_GdkEvent>(_GdkEvent*)+0x15df0
#
# An error report file with more information is saved as:
# /home/ipcreeper/hs_err_pid8150.log
#
# If you would like to submit a bug report, please visit:
#   http://java.sun.com/webapps/bugreport/crash.jsp
# The crash happened outside the Java Virtual Machine in native code.
# See problematic frame for where to report the bug.
#

Searching for at least an hour I’ve finally found the solution:

 

Step 1:

Download and install libhunspell package (xulrunner has a dependency on it):

http://packages.ubuntu.com/oneiric/amd64/libhunspell-1.2-0/download

sudo dpkg -i libhunspell-1.2-0_1.2.14-4_amd64.deb

Step 2:

Download and install xulrunner package:

http://packages.ubuntu.com/lucid/amd64/xulrunner-1.9.2/download

sudo dpkg -i xulrunner-1.9.2_1.9.2.28+build1+nobinonly-0ubuntu0.11.04.1_amd64.deb

Be aware that both libhunspell and xulrunner should be either i386 or amd64 version.

Step 3:

Open eclipse.ini and add path to installed xulrunner:
-Dorg.eclipse.swt.browser.XULRunnerPath=/usr/lib/xulrunner-1.9.2.28

Step 4:

If editor still not running, try to set the environment variable GDK_NATIVE_WINDOWS to false before starting Eclipse. Do it with following command:

export GDK_NATIVE_WINDOWS=false
11 Nov

How to switch version of Java in Ubuntu

Had a little headache trying to change version of JDK back from 1.7 to 1.6, so here is the instruction:

sudo add-apt-repository ppa:nilarimogard/webupd8
sudo apt-get update
sudo apt-get install update-java

Then type:

sudo update-java

… and you’ll see the window with versions of Java to switch to.

Voila.

P.S. To extend the list of available JDK’s download the version you need and extract it to /usr/lib/jvm/